h1 {
    a {
        display: inline-block;
        margin-right: 10px;
        font-size: 16px;
        &.actived {
            color:red
        }
    }
}

.header{
    height: 44px;
    line-height: 44px;
    background: #000;
    color: #fff;
    a{
        color: #fff;
        padding: 10px 40px;
    }
    .actived{
        color: red;
    }
}